Piston tool



*l 'Plantea a, 1927s f i l its-8,189

emnnnwmvrm, or Samaritan, mLINoisfassIeNonQrownavn MANU;

racrnnmeeomnn, oir SPRINGFIELD, nlnmo'iaaconrcnajrron or mirrors..

' risfronroor...

' 'fifppiicauqirmei nafta, 19, 1924. seriaiijroj'roogoaff 'wear `or otherwise, itis desirable to increase 'l5 `thesizes of s uc'h holes or bearings accurately for' the reception rof oversize pistonlpins.

` D' suchbroaching 'operation a very substantial pressure is exerted on vthe piston itself through, the Vbroachfwhich tends` to "flatten lor distort it, andthe `present inven- ,v tionrelates to a siinplejadjustable tool which isdesi ed'to be insertedin the-piston and expan r the adjacent ,faces lof'v the internal apertured bosses, thus actin ,as an-inner support l A:for the piston yto enab ekthe. latter to with 'standrthe breach-operatingA strains without deformation or'distnrtion. v'

x ln'order Athat those skilled in this art may so have va full and complete understanding of vthe inventionland its v'various advantages, in

the 1aecomp,a'nying drawing-forming apart ofthis specification, and throughout the several views vof'which'like reference characters 15 have been applied to the same arts, I have illustrated in detaillponedesira le and preferredembodiment 'off the` invention. e

In such drawingf- 'Figf'l showsthe new toolf" applied to "a p piston undergoing vthe broaohing operation,

`the piston being shown in central, longitudinal section,fwhile the tool 'and'b'roach are both illustrated linelevation;

2 is an `elevationalview at right angles to that of Fig. y'1, the piston being "partly broken awa A to illustrate the inter- .nal arrangement. Athepartsg and. l

Fi 3 depicts the tool itself in central, lengt wisesection. v v

. Referring to the views of' this drawing, litkwill be seen that the'internal-combustion 'motor piston" 11, 'which'jislvtohave its pistonin apertures accurately increased in size breaching, hasthe two, usual, inwardlyne extended, alined bosses 12, 12 in its interior,

tore'am out, the 'wrist.

edjlaterallyjbetween and; to bear on thepiston "and "bossesl beingapertured .in alinement'to receive the pairV of registering, hollow bushings or sleeves. 13, .13, lwhich are forced' into such a erturesV and imposition therein y thel greatfrlction cref ated by their introduction' under substantial pressure.

:It is to andi which are designed andy .intendeel` to receive'the piston-pin or wrist-pin, are-to n be breached to tlierequired larger sizeby the. broach `15 off known :and usual construction having aplurality' or series of'spaced, Aannulaigcuttin'.; teethl, 16 of slightly-pro s gra .11 i

gressivel i ally increasing size.` i s. Accor ingly, in' order to ymaintain the iston in its original, perfectly round orcy indrical shape, it is necessary-utf) support it or f I brace it 'during the broav such a way as to eliminatezall distortion vor deformation.` f

' g operation in possibility "of easily accomplishes. y f a Such implement comprises the main block 17y which l.affords afbearingylS for the re duced-diameter part-*19 -cf a yscrew-threaded rod or shaft 21 having threaded engagement at `22 with'a fork-shaped wedge 23 adapted to heV moved away' from land toward-the 'shaft/by means of a handle '24 v inned-'or otherwise fixed on the "protru, in'g end thereof.l-` V 4Len hwise shifting of the shaft or rod yin its caring y18 isprevented by a collaror washer 25 interposed between the lshoulder 26 of the shaft and the adjacent'face of the blockl 17', and by a second, similar'washer or collar 27 kbetween the handle' 24 andthe proximateI facexof the block. -This wedge is interposed'rbetween and co'-k springs to the opposite surfaces of the block.v

' By turning the handle 24 and itssliaft 21 in one of the threaded connection, will 'be drawn firmly held f be vthat the holesor bearings 14', 14 through such bushings or sleeves,I

This functiony and` resultthe new memberl'rby the turning of the ,rod 'or direction, the wedge 23, by "means A exol " acts vwith -a pair jof 1 tapered, fork-shaped combination off a recessedbracing member adapted to bear against the inner face of one of the -interna apertured lbosses of a piston, a spring mounting for said member prmitting it to bear evenly on the face of said boss, and recessed sliding wed to press said member. against said recesses being adapted to accommodatea tool means -in saidboss aperture.

7. In a tool of the character described, the

combination of a pair of recessed bracing members adapted to bear against the inner faces of the mternal apertured bosses of a ace, saidA piston, mountin'gs for said members permitting them to assume positions to bear evenly 15 v GAILARD E. WEAVER. 

